Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f55c4c908f844f1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 13:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2238455a6651bb808a60d29108bab387 SHA-1: 2e3799bc007d4eb3e1ee9a9e0de4c4ba389b689a SHA-256: 2f55c4c908f844f1700206de663c02a7e6a8abcae36365db036753c08a089c81
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate it's part of a link farm and an advance-fee scam, luring victims with promises of prizes or funds requiring a delivery fee. The embedded JavaScript and numerous external links, some pointing to compromised WordPress uploads, strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://myphamasia.net/upload/files/sarapitumaw.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/52615776493.pdf
    • https://zhbiotech.com/CKEdit/upload/files/wabezusatodurogokutuje.pdf
    • http://cartonwrappingmachine.com/userfiles/file/bedev.pdf
    • http://yourhandmadeitems.com/userfiles/file/mijoliruxadime.pdf
    • https://cjsc.se/ckfinder/userfiles/files/68142912743.pdf
    • http://moutierrozeille.fr/userfiles/file/68378304909.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/6958567246.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/73972b6f1222c383340c888e4963b43c/46481431542.pdf
    • https://nikolsbeauty.com/webroot/f/uploads/file/buwesajafotisi.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3920058967.pdf
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/84304033760.pdf
    • http://www.moyekolodin.com/files/gudok.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/44594c648c7905300439705885f1e42c/fodetitezomikusuved.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19094351824.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/be00a5265fcc8b999d837b260b5da7d7/58990861456.pdf
    • http://megalaserasia.com/upload///94650358362.pdf
    • https://guanlai.tw/uploads/files/202109131925282074.pdf
    • http://togul.org/sites/default/files/file/11372712806.pdf
    • http://anchor-m.com/js/upload/files/nabigavemaxipiwufigoxo.pdf
    • http://beloezoloto.ru/userfiles/file/72077198290.pdf
    • https://soechi.id/userfiles/file/rifawiwunusezebodanizixu.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/85181817739.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=powerpoint+on+android+phone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e679.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 16792 bytes
font_01_sfnt_off0000fe90.bin
012be80afb7e6f8f34c51ee6389092d05741c41b9ff49f7282488a353e6b3c53
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 10364 bytes
font_02_sfnt_off000115ea.bin
d634caa2c5ee258e69e3b0ce209ea53a21aced7a68b5d56ff3e75f7ed06b262e
pdf-font-stream PDF embedded font (sfnt) at offset 0x115EA 17620 bytes